Need regular expression for oracle date format 'DD-MON-YYYY'

Hi,
Can anybody tell me the regular expression to validate date in 'DD-MON-YYYY'.
My concept is i have a table with just two columns item_name and item_date
Both fields are varchar2 and i want to fetch those records from this table which have valid date format('DD-MON-YYYY').

If it must be a regexp, this is a starter for you, note it carries the caveats mentioned by both posters above and in the linked thread
mkr02@ORA11GMK> with data as (select '10-jan-2012' dt from dual
2 union all select '10-111-2012' from dual
3 union all select 'mm-jan-2012' from dual
4 union all select '10-jan-12' from dual)
5 select
6 dt,
7 case when regexp_like(dt,'[[:digit:]]{2}-[[:alpha:]]{3}-[[:digit:]]{4}','i') then 1 else 0 end chk
8 from data
9 /
DT                 CHK
10-jan-2012          1
10-111-2012          0
mm-jan-2012          0
10-jan-12            0It will not validate content, only string format.
And to emphasis the points made in the linked thread - dates in text columns is poor design. Always.

Similar Messages

Need a Better Regular Expression for Validating Dates

I have data coming from file with date in the format DD-MON-YY.
I have created the following regular expression:
'^([0-2]{1}[0-9]{1}|[3]{1}[0-1]{1})-(JAN|FEB|MAR|A PR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC|Jan|Feb|Mar|Apr |May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-[[:digit:]]{2}$'
However, it doesn't catch dates like 31-APR, 29-FEB. Can someone make changes to it to make it foolproof
WITH temp AS
(SELECT '29-FEB-07' AS COL1 FROM DUAL
UNION ALL
SELECT '31-APR-08' FROM DUAL
UNION ALL
SELECT '32-JAN-08' FROM DUAL
UNION ALL
SELECT '29-MAR-08' FROM DUAL
UNION ALL
SELECT '31-JAN-08' FROM DUAL)
SELECT COL1,
CASE WHEN REGEXP_LIKE(COL1,'^([0-2]{1}[0-9]{1}|[3]{1}[0-1]{1} )-(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC |Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)- [[ :digit:]]{2}$')
THEN 'VALID'
ELSE 'INVALID'
END
FROM TEMP;

Hi,
Please check this function.
The function works for the dates in the format 'DD-MON-YYYY','DD/MON/YYYY'.
create or replace function date_validation_f(v_date varchar2) return varchar2 is
v_ip_date     date;
v_ip_date_ch varchar2(20);
v_ip_year number;
v_ip_month char(3);
v_ip_day   number;
v_return   varchar2(10);
v_leap_year_check number :=0 ;
type v_month_name_typ      is varray (12) of char(3);
type v_month_last_day_typ is varray (12) of number(2);
v_month_name     v_month_name_typ    :=v_month_name_typ('JAN','FEB','MAR','APR','MAY','JUN','JUL','AUG','SEP','OCT','NOV','DEC');
v_month_last_day v_month_last_day_typ:=v_month_last_day_typ(31,28,31,30,31,30,31,31,30,31,30,31);
begin
--Assuming that input date is in the format DD-MON-YYYY or DD/MON/YYYY
v_return := 'invalid';
v_ip_date := to_date(v_date);
v_ip_date_ch := to_char(v_ip_date,'DD-MON-YYYY');
dbms_output.put_line('v_ip_date_ch := '||v_ip_date_ch);
v_ip_month   := substr(v_ip_date_ch,4,3);
dbms_output.put_line('v_ip_month := '||v_ip_month);
v_ip_day    := substr(v_ip_date_ch,1,2);
dbms_output.put_line('v_ip_year := '||v_ip_year);
v_ip_year     := to_number(substr(v_ip_date_ch,8,4));
dbms_output.put_line('v_ip_day := '||v_ip_day);
-- Ckecking for leap year
if MOD(v_ip_year,4)=0 then
if MOD(v_ip_year,100)=0 then
    if MOD(v_ip_year,400)=0 then
       v_leap_year_check:=1;
    end if;
else
       v_leap_year_check:=1;
end if;
end if;
if v_leap_year_check = 1 then
   v_month_last_day(2):=29;
end if;
for i in 1..12
loop
if v_month_name(i)=upper(v_ip_month) then
     if v_ip_day between 1 and v_month_last_day(i) then
        v_return := 'valid';
        exit;
    else
        v_return := 'invalid';
        exit;
    end if;
end if;
end loop;
dbms_output.put_line('v_return := '||v_return );
return v_return;
exception
when others then
return v_return;
dbms_output.put_line(SQLERRM);
end;you can use this function in SELECT statement.
Edited by: Sreekanth Munagala on Nov 13, 2008 11:25 PM

Regular expression for email address formats

I have the following regulare expression which I am using to validate email address format.
This allows addresses of the form
[email protected]
^[-a-zA-Z0-9._]+\@[-a-zA-Z0-9]+\.[-a-zA-Z0-9]+\.[-a-zA-Z0-9]+$
And of course this allows addresses of the form
[email protected]
^[-a-zA-Z0-9._]+\@[-a-zA-Z0-9]+\.[-a-zA-Z0-9]+$
What I'm looking for is something which will allow both.

This way
'^[-a-zA-Z0-9._]+\@[-a-zA-Z0-9.]+$' would allow both. :-)
with test_data as
( select '[email protected]' as val from dual union all
select '[email protected]'   as val from dual union all
select 'no#good'              as val from dual
select
val ,
case
    when regexp_like( val, '^[-a-zA-Z0-9._]+\@[-a-zA-Z0-9.]+$' ) then 'Y'
    else 'N'
    end
    as good
from test_data ;
VAL                  G
[email protected] Y
[email protected]   Y
no#good              NBut then again, it would also allow "[email protected]" and "[email protected]" too. So I suspect you don't really want something that simply allows your two cases to pass validation. If you want to allow only those two cases then try something like this.
with test_data as
( select '[email protected]'     as val from dual union all
select '[email protected]'       as val from dual union all
select '[email protected]' as val from dual union all
select '[email protected]'      as val from dual union all
select 'no#good'                  as val from dual
select
val ,
case
    when
      regexp_like
      ( val
      , '^[-a-zA-Z0-9._]+\@[-a-zA-Z0-9]+\.[-a-zA-Z0-9]+(\.[-a-zA-Z0-9]+)?$'
      ) then 'Y'
    else 'N'
    end
    as good
from test_data ;
VAL                      G
[email protected]     Y
[email protected]       Y
[email protected] N
[email protected]      N
no#good                  N--
Joe Fuda
SQL Snippets
Message was edited by SnippetyJoe - added clarification.

Convert varchar2 field into date formatted: DD-MON-YYYY

Thanks in advance for anyone's help on this matter as I know it takes your time and expertise. I am pretty new to SQL but learning my way through it just have an issue with a text to date field conversion. It is an Oracle 10g database and I am writing in SQL. There is a field called Demand which is formatted in varchar2 format of ddmmyy. There is also a field that is formatted as a date called Payment which is formatted as DD-MON-YYYY.
Essentially I need to do a simple Payment >= Demand, however as you can see that is some issue with that being a varchar2 field. Does anyone know if it is possible to do that type of expression against those two fields. Was thinking about possibly converting the varchar2 to a date but not sure how to get to that DD-MON-YYYY format.
Also there are situations where this Demand field will often times be null as it would have never recieved any outbound correspondence in the past and would not have a date at all.
Thanks
Edited by: user10860766 on Aug 18, 2009 8:14 AM
Edited by: user10860766 on Aug 18, 2009 8:19 AM

Hi,
It's hard to detect bad dates in pure SQL, especially if you need to be precise about when February 29 is valid.
It's easy with a user-define function, like the one in [this thread|http://forums.oracle.com/forums/thread.jspa?messageID=3669932&#3669932].
Edited by: Frank Kulash on Aug 18, 2009 3:50 PM
To create a stand-alone function:
CREATE OR REPLACE FUNCTION     to_dt
(     in_txt          IN     VARCHAR2                    -- to be converted
,     in_fmt_txt     IN     VARCHAR2     DEFAULT     'DD-MON-YYYY'     -- optional format
,     in_err_dt     IN     DATE          DEFAULT     NULL
RETURN DATE
DETERMINISTIC
AS
BEGIN
     -- Try to convert in_txt to a DATE. If it works, fine.
     RETURN     TO_DATE (in_txt, in_fmt_txt);
EXCEPTION     -- If TO_DATE caused an error, then this is not a valid DATE: return in_err_dt
     WHEN OTHERS
     THEN
          RETURN in_err_dt;
END     to_dt
/To use it:
SELECT primary_key -- and/or other columns to identify the row
,       demand
FROM    table_x
WHERE   demand          IS NOT NULL
AND     to_dt ( demand
           , 'DDMMYY'
           )          IS NULL;

Need a regular expression for the text field

Hi ,
I need a regular expression for a text filed.
if the value is alphanumeric then min 3 char shud be there
and if the value is numeric then no limit of chars in that field.[0-9].
Any help is appriciated...
thanks
bharathi.

Try the following in the change event:
r=/^[a-z]{1,3}$|^\d+$/i;
if (!r.test(xfa.event.newText))
xfa.event.change="";
Kyle

Re:java regular expression for website

Hi All,
I am using jdeveloper 11.1.2.3.0
My requirement is that I have a website attribute I need the regular expression for the website attribute
to display the format www.google.com www.oracle.com.
Thanks,
Sandeep

Hi Sandeep,
you can use the below code for website validation.
<af:inputText label="" id="time" simple="true" value="" contentStyle="width:100px;" maximumLength="100">
      <af:validateRegExp pattern="^www[.][a-z]{1,15}[.](com|org)$"
                     messageDetailNoMatch="Website must be like www.google.com"
                                                                                               hint="Website Format: www.google.com"/>
    </af:inputText>
as per your requirement you can change the pattern.
Thanks
Prabhat

Convert Oracle date format masks to Java format masks

Have an application based on Oracle that stores data in text form (for display) and in native date format. It is being migrated to another application with a Java based front end that can only use Java format masks to display the dates in the desired display format.
Is there a way to translate the Oracle format masks to Java? I can do this in SQL or PL/SQL using the database or in Java.
I really don't want to write detailed code to parse the masks, although if parsers are available to take an oracle mask into its metadata (minute, year, etc), it may be possible for me to write the code.
This seems like something that must have been done many times over the years. I would prefer to reuse workable code rather than reinventing the wheel.
To be clear, I do not need to alter data or convert dates shown in string form. Just the format masks so the new app will display dates in the same manner as the old app. Fortunately, both apps handle interpreting the format masks in their native technology, so it is just converting the format mask.

kenmadsen wrote:
Both applications have a varchar2 column and a date column. A date picker selects and returns the date in native format for storage and the application uses the mask to format the varchar2 column for display (and storage). The old application uses an Oracle date format mask DD-Mon-YYYY HH24:MI and the new application uses Java date masks (DD-MM-YYYY hh:mm). (I may not have the translation from HH24 to hh correct).
The date column and the display column store the same information (a date), but one is stored natively and the other is displayed as the application administrator want the particular row to be formatted for display. (the mask is a column in the same table as the other 2 columns). Each row has characteristics (other columns) that determines what the data is and how it should be shown (some things need to show time; others only the date)
So the problem is, when migrating, the new application cannot render the dates as the old app did because "Mon" is Oracle format, not Java format.
No data is being converted in the migration, except for the mask itself. Both applications have the same record structure with respect to these columns and they both use the mask to generate the formatted varchar2 data for display in the application and storage.too bad you insist on try to describe with words rather than actual CODE.
Please explain again why this is an Oracle problem & NOT a Java problem?
Oracle RDBMS is a data repository & can't automagically change data content for you.

Regular expression vs oracle text performance

Does anyone have experience with comparig performance of regular expression vs oracle text?
We need to implement a text search on a large volume table, 100K-500K rows.
The select stmt will select from a VL, a view joining 2 tables, B and _TL.
We need to search 2 text columns from this _VL view.
Using regex seems less complex, but the deciding factor is of course performace.
Would oracle text search perform better than regular expression in general?
Thanks,
Margaret

Hi Dominc,
Thanks, we'll try both...
Would you be able to validate our code to create the multi-table index:
CREATE OR REPLACE PACKAGE requirements_util AS
PROCEDURE concat_columns(i_rowid IN ROWID, io_text IN OUT NOCOPY VARCHAR2);
END requirements_util;
CREATE OR REPLACE PACKAGE BODY requirements_util AS
PROCEDURE concat_columns(i_rowid IN ROWID, io_text IN OUT NOCOPY VARCHAR2)
AS
tl_req pjt_requirements_tl%ROWTYPE;
b_req pjt_requirements_b%ROWTYPE;
CURSOR cur_req_name (i_rqmt_id IN pjt_requirements_tl.rqmt_id%TYPE) IS
SELECT rqmt_name FROM pjt_requirements_tl
WHERE rqmt_id = i_rqmt_id;
PROCEDURE add_piece(i_add_str IN VARCHAR2) IS
lx_too_big EXCEPTION;
PRAGMA EXCEPTION_INIT(lx_too_big, -6502);
BEGIN
io_text := io_text||' '||i_add_str;
EXCEPTION WHEN lx_too_big THEN NULL; -- silently don't add the string.
END add_piece;
BEGIN
     BEGIN
          SELECT * INTO b_req FROM pjt_requirements_b WHERE ROWID = i_rowid;
          EXCEPTION
          WHEN NO DATA_FOUND THEN
          RETURN;
     END;
     add_piece(b_req.req_code);
     FOR tl_req IN cur_req_name(b_req.rqmt_id) LOOP
     add_piece(tl_req.rqmt_name);
END concat_columns;
END requirements_util;
EXEC ctx_ddl.drop_section_group('rqmt_sectioner');
EXEC ctx_ddl.drop_preference('rqmt_user_ds');
BEGIN
ctx_ddl.create_preference('rqmt_user_ds', 'USER_DATASTORE');
ctx_ddl.set_attribute('rqmt_user_ds', 'procedure', sys_context('userenv','current_schema')||'.'||'requirements_util.concat_columns');
ctx_ddl.set_attribute('rqmt_user_ds', 'output_type', 'VARCHAR2');
END;
CREATE INDEX rqmt_cidx ON pjt_requirements_b(req_code)
INDEXTYPE IS CTXSYS.CONTEXT
PARAMETERS ('DATASTORE rqmt_user_ds
SYNC (ON COMMIT)');

Request some help, over procedure's performance uses regular expressions for its functinality

Hi All,
        Below is the procedure, having functionalities of populating two tables. For first table, its a simple insertion process but for second table, we need to break the soruce record as per business requirement and then insert into the table. [Have used regular expressions for that]
        Procedure works fine but it takes around 23 mins for processing 1mm of rows.
        Since this procedure would be used, parallely by different ETL processes, so append hint is not recommended.
        Is there any ways to improve its performance, or any suggestion if my approach is not optimized? Thanks for all help in advance.
CREATE OR REPLACE PROCEDURE SONARDBO.PRC_PROCESS_EXCEPTIONS_LOGS_TT
     P_PROCESS_ID       IN        NUMBER,
     P_FEED_ID          IN        NUMBER,
     P_TABLE_NAME       IN        VARCHAR2,
     P_FEED_RECORD      IN        VARCHAR2,
     P_EXCEPTION_RECORD IN        VARCHAR2
    IS
    PRAGMA AUTONOMOUS_TRANSACTION;
    V_EXCEPTION_LOG_ID     EXCEPTION_LOG.EXCEPTION_LOG_ID%TYPE;
    BEGIN
    V_EXCEPTION_LOG_ID :=EXCEPTION_LOG_SEQ.NEXTVAL;
         INSERT INTO SONARDBO.EXCEPTION_LOG
             EXCEPTION_LOG_ID, PROCESS_DATE, PROCESS_ID,EXCEPTION_CODE,FEED_ID,SP_NAME
            ,ATTRIBUTE_NAME,TABLE_NAME,EXCEPTION_RECORD
            ,DATA_STRUCTURE
            ,CREATED_BY,CREATED_TS
         VALUES
         (   V_EXCEPTION_LOG_ID
            ,TRUNC(SYSDATE)
            ,P_PROCESS_ID
            ,'N/A'
            ,P_FEED_ID
            ,NULL
            ,NULL
            ,P_TABLE_NAME
            ,P_FEED_RECORD
            ,NULL
            ,USER
            ,SYSDATE
        INSERT INTO EXCEPTION_ATTR_LOG
            EXCEPTION_ATTR_ID,EXCEPTION_LOG_ID,EXCEPTION_CODE,ATTRIBUTE_NAME,SP_NAME,TABLE_NAME,CREATED_BY,CREATED_TS,ATTRIBUTE_VALUE
        SELECT
            EXCEPTION_ATTR_LOG_SEQ.NEXTVAL          EXCEPTION_ATTR_ID
            ,V_EXCEPTION_LOG_ID                     EXCEPTION_LOG_ID
            ,REGEXP_SUBSTR(str,'[^|]*',1,1)         EXCEPTION_CODE
            ,REGEXP_SUBSTR(str,'[^|]+',1,2)         ATTRIBUTE_NAME
            ,'N/A'                                  SP_NAME
            ,p_table_name
            ,USER
            ,SYSDATE
            ,REGEXP_SUBSTR(str,'[^|]+',1,3)         ATTRIBUTE_VALUE
        FROM
        SELECT
             REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,t2.COLUMN_VALUE) str
        FROM
            DUAL t1 CROSS JOIN
                    TABLE
                        CAST
                            MULTISET
                                SELECT LEVEL
                                FROM DUAL
                                CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
                            AS SYS.odciNumberList
                    ) t2
        WHERE REGEXP_SUBSTR(str,'[^|]*',1,1) IS NOT NULL
        COMMIT;
       EXCEPTION
         WHEN OTHERS THEN
         ROLLBACK;
         RAISE;
    END;
Many Thanks,
Arpit

Regex's are known to be CPU intensive specially when dealing with large number of rows.
If you have to reduce the processing time, you need to tune the Select statements.
One suggested change could be to change the following query
SELECT
             REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,t2.COLUMN_VALUE) str
        FROM
            DUAL t1 CROSS JOIN
                    TABLE
                        CAST
                            MULTISET
                                SELECT LEVEL
                                FROM DUAL
                                CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
                            AS SYS.odciNumberList
                    ) t2
to
SELECT REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,level) str
FROM DUAL
CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
Before looking for any performance benefit, you need to ensure that this does not change your output.
How many substrings are you expecting in the P_EXCEPTION_RECORD? If less than 5, it will be better to opt for SUBSTR and INSTR combination as it might work well with the number of records you are working with. Only trouble is, you will have to write different SUBSTR and INSTR statements for each column to be fetched.
How are you calling this procedure? Is it not possible to work with Collections? Delimited strings are not a very good option as it requires splitting of the data every time you need to refer to.

Regular Expressions in Oracle

Hello All,
I come from Perl scripting language background. Perl's regular expressions are rock solid, robust and very fast.
Now I am planning to master Regular Expressions in Oracle.
Could someone please point the correct place to start with it like official Oracle documentation on Regular Expressions, any good book on Regex or may be any online link etc.
Cheers,
Parag
Edited by: Parag Kalra on Dec 19, 2009 11:03 AM

Hi, Parag,
Look under [R in the index of the SQL language manual|http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/index.htm#R]. All the regular expression functions and operators start with "REGEXP", and there are a couple of entries under "regular expressions".
That applies to the Oracle 11 and 10.2 documentation. Regular expressions were hidden in the Oracle 10.1 SQL Language manual; you had to look up some similar function (like REGR_SYY, itself hidden under S for "SQL Functions", and then step through the pages one at a time.
Sorry, I don't know a good tutorial or introduction.
If you find something hopeful, please post a reference here. I think a lot of people would be interrested.

How to form a regular expression for matching the xml tag?

hi i wanted to find the and match the xml tag for that i required to write the regex.
for exmple i have a string[] str={"<data>abc</data>"};
i want this string has to be splitted like this <data>, abc and </data>. so that i can read the splitted string value.
the above is for a small excercise but the tagname and value can be of combination of chars/digits/spl symbols like wise.
so please help me to write the regular expression for the above requirement

your suggestion is most appreciable if u can give the startup like how to do this. which parser is to be used and stuff like that

How to write the regular expression for Square brackets?

Hi,
I want regular expression for the [] Square brackets.
I have tried to insert in the below code but the expression not validate the [] square brackets.
If anyone knows please help me how to write the regular expression for [] Square brackets.
private static final Pattern DESC_PATTERN = Pattern.compile("({1}[a-zA-Z])" +"([a-zA-Z0-9\\s.,_():}{/&#-]+)$");Thanks
Raghav

Since square brackets are meta characters in regex they need to be escaped when they need to be used as regular characters so prefix them with \\ (the escape character).

URGENT !!! need regular expression

Hi ,
I need a regular expression for a text field
What if we left the 3 character limit on alphanumeric characters (a-z/A-Z) and remove the limit for numeric characters only (0-9)?
Thing is if user enters alphanumeric values then there should be limit of 3 characters for the text filed.
if user enter numeric values then there be no limit .
i think i have given a clear explanation regarding my question....
any replies are appreciated..
thanks
bharathi..

Try the following in the change event:
r=/^[a-z]{1,3}$|^\d+$/i;
if (!r.test(xfa.event.newText))
xfa.event.change="";
Kyle

What is the regular expression for the end of a story?

Forgive me if this is wrong forum for asking this, but I'm trying to use the Find command using GREP and I need to know the regular expression for the end of a story. (Or, the last character of a story.) Thanks in advance.

I'd try search for .\z (that's a dot in front) which ought to find the very last character in the story, and replace with $0 and your additional text.
You know you can use a keyboard shortcut to move your cursor to the end of any story, right? Ctrl + End on Windows, Cmd + End, I think, on Mac. Unless you want to do this to every single story in the document, I would think you might be just as well off to put your text on the clipboard, put the cursor in the story and hit the key combo followed by Ctrl/Cmd + V to paste.

Regular Expression For Dreamweaver

I still haven't had the time to really become a professional when it comes to regular expressions, and sadly I am in need of one an finding it difficult to wrap my head around.
In a text file I have hundreds of instances like the following:
{Click here to visit my website}{http://www.adobe.com/}
I need a regular expression for Dreamweaver that I can run within the "Find and Replace" window to switch the order of the above elements to:
{http://www.adobe.com/}{Click here to visit my website}
Can anyone provide some guidance? I'm coming up short due to my lack of experience with regular expressions.
Thank you in advance!

So you have a string that starts { and goes until the first }. Then you have another string exactly the same. And you want to swap them. I'm not making any assumption that the second one has to look like a URL (that's a whole other minefield, but perhaps you could do something simple like it must start with http).
You don't specify how your text file is divided up, have you got this as a complete line to itself, or is it just a huge block of text? Preferably as individual lines.
I don't have Dreamweaver, but this worked for me in Notepad++
Find: ^{(.*?)}{(.*?)}$
Replace with: {\2}{\1}
My file looked like this:
{Click here to visit my website}{http://www.adobe.com/}
{some other site}{http://www.example.com/foo}
And doing a Replace All ended up like this:
{http://www.adobe.com/}{Click here to visit my website}
{http://www.example.com/foo}{some other site}

Need regular expression for oracle date format 'DD-MON-YYYY'

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